The program monitors the inserts, updates and deletes in a database table and notifies all the browsers with a session established every time the contents of the table change.
- Maven 3
- Spring Boot
- Embedded Tomcat
- Spring Data JPA: Hibernate + H2
- Spring Integration: Apache ActiveMQ
- Logging: sl4j + logback (by Spring Boot Logging)
- Spring Websocket
- Thymeleaf
- Mockito
- UI: Bootstrap + JQuery + Stomp over SockJS
The application can be built using the following maven command:
$ mvn package
The resulting jar is in the target/ folder. It can be run as a runnable jar:
$ java -jar target/action-monitor-1.0-SNAPSHOT.jar
The application will be accessible on http://localhost:8080/. The user interface is pretty simple; it offers two pages:
- Listener: events will appear hear in colored boxes depending on what kind of changes have been made.
- Management: this page lists the entities in the system. A new one can be inserted using the input field and button. Existing ones can be edited or removed using the buttons.
There are some unit tests written mainly for the core logic (MagicService and ActionQueueHandler). It can seem to be a bit over-engineered, in a real life application it would make more sense. However I did not write tests for the controllers because they are really just invoking the service and putting the results into the model of the view.
I wanted to make also an integration test for testing the queue, but could not find an elegant way to make assertions after dequeuing.